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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// ignore-wasm32-bare no libc to test ffi with
#![feature(libc)]
extern crate libc;
use std::mem;
use libc::{c_double, c_int};
fn to_c_int(v: &mut isize) -> &mut c_int {
unsafe {
mem::transmute_copy(&v)
}
}
fn lgamma(n: c_double, value: &mut isize) -> c_double {
unsafe {
return m::lgamma(n, to_c_int(value));
}
}
mod m {
use libc::{c_double, c_int};
#[link_name = "m"]
extern {
#[cfg(any(unix, target_os = "cloudabi"))]
#[link_name="lgamma_r"]
pub fn lgamma(n: c_double, sign: &mut c_int) -> c_double;
#[cfg(windows)]
#[link_name="lgamma"]
pub fn lgamma(n: c_double, sign: &mut c_int) -> c_double;
}
}
pub fn main() {
let mut y: isize = 5;
let x: &mut isize = &mut y;
assert_eq!(lgamma(1.0 as c_double, x), 0.0 as c_double);
}
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